The Two-tone Iridium bent nib is curved for fude calligraphy . You can write from fine to thick broad by varying the writing angle. Some customers also call this as italic calligraphy fountain pen. Take International standard Cartridge ( compatible with ASIN B00W01VCJA ) Capped length 135mm ; Posted length 137mm ; Diameter 13mm ; pen weight 40g ; Cap : Push Type Package : One pen with removable converter for bottle ink and one pen pouch If there is any reason you do not like the pen, just send us a message! The fude nib was made of specail stainless steel ,You can write from 0.5 to 1.2 mm by varying the writing angle . It is a nice pen for daily writing , signature and art drawing.